No it will not. Sounds like the transmission has a major problem.
The transmission
Engine, Transmission, Drive shaft and Rear End Differential.
The differential, often referred to as the "rear", is the gear housing which transmits the rotation of the driveshaft to the rear wheels. A four-wheel drive truck also has a differential for the front wheels.
truck will only go forward not in reverse does this mean the transmission is gone
the rear front axle gear box would brake then it would snow drops of water
You may need differential fluid...check that.
You are probably low on transmission fluids
pres the brake until it moves
You will have to remove the rear end plate. NEUTZ
No there is not. Whats the problem no heat ?? If so try this, reverse the heater hoses on the heater core and then go drive the truck and see if you get heat.
gear ratio
Someone who knows how to drive a truck and is legally licensed to drive a truck has to train you, so that you can drive a truck (but you do also have to get a license).